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Finding the Fourth Proportional to 608.40, 840.76 and 451.24

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Solution

The fourth proportional to 608.40, 840.76 and 451.24 is: 623.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    608.40 : 840.76 = 451.24 : x
  2. Step 2: Convert to fraction form
    608.40/840.76 = 451.24/x
  3. Step 3: Cross multiply
    608.40x = 840.76 × 451.24
  4. Step 4: Simplify right side
    608.40x = 379,384.54
  5. Step 5: Solve for x
    x = 379,384.54/608.40
  6. Step 6: Final answer
    x = 623.58

Related Problems

Find fourth proportional to 304.20, 420.38 and 225.62
Half scale
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Double scale
Find fourth proportional to 609.40, 842.14 and 452.24
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.