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Finding the Fourth Proportional to 656,442.80, 982,695.90 and 390,066.20

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Solution

The fourth proportional to 656,442.80, 982,695.90 and 390,066.20 is: 583,929.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    656,442.80 : 982,695.90 = 390,066.20 : x
  2. Step 2: Convert to fraction form
    656,442.80/982,695.90 = 390,066.20/x
  3. Step 3: Cross multiply
    656,442.80x = 982,695.90 × 390,066.20
  4. Step 4: Simplify right side
    656,442.80x = 383,316,455,468.58
  5. Step 5: Solve for x
    x = 383,316,455,468.58/656,442.80
  6. Step 6: Final answer
    x = 583,929.71

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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.