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Finding the Fourth Proportional to 910.76, 1,365.18 and 390.60

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Solution

The fourth proportional to 910.76, 1,365.18 and 390.60 is: 585.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    910.76 : 1,365.18 = 390.60 : x
  2. Step 2: Convert to fraction form
    910.76/1,365.18 = 390.60/x
  3. Step 3: Cross multiply
    910.76x = 1,365.18 × 390.60
  4. Step 4: Simplify right side
    910.76x = 533,239.31
  5. Step 5: Solve for x
    x = 533,239.31/910.76
  6. Step 6: Final answer
    x = 585.49

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Double scale
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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.