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Finding the Fourth Proportional to 921.39, 1,272.37 and 585.40

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Solution

The fourth proportional to 921.39, 1,272.37 and 585.40 is: 808.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.39 : 1,272.37 = 585.40 : x
  2. Step 2: Convert to fraction form
    921.39/1,272.37 = 585.40/x
  3. Step 3: Cross multiply
    921.39x = 1,272.37 × 585.40
  4. Step 4: Simplify right side
    921.39x = 744,846.81
  5. Step 5: Solve for x
    x = 744,846.81/921.39
  6. Step 6: Final answer
    x = 808.39

Related Problems

Find fourth proportional to 460.70, 636.18 and 292.70
Half scale
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Double scale
Find fourth proportional to 922.39, 1,273.75 and 586.40
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.