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Finding the Fourth Proportional to 662,489.76, 914,355 and 390,541.44

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Solution

The fourth proportional to 662,489.76, 914,355 and 390,541.44 is: 539,017.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    662,489.76 : 914,355 = 390,541.44 : x
  2. Step 2: Convert to fraction form
    662,489.76/914,355 = 390,541.44/x
  3. Step 3: Cross multiply
    662,489.76x = 914,355 × 390,541.44
  4. Step 4: Simplify right side
    662,489.76x = 357,093,518,371.20
  5. Step 5: Solve for x
    x = 357,093,518,371.20/662,489.76
  6. Step 6: Final answer
    x = 539,017.42

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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.