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Finding the Fourth Proportional to 390,612.96, 539,060.40 and 220,836.96

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Solution

The fourth proportional to 390,612.96, 539,060.40 and 220,836.96 is: 304,763.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,612.96 : 539,060.40 = 220,836.96 : x
  2. Step 2: Convert to fraction form
    390,612.96/539,060.40 = 220,836.96/x
  3. Step 3: Cross multiply
    390,612.96x = 539,060.40 × 220,836.96
  4. Step 4: Simplify right side
    390,612.96x = 119,044,459,992.38
  5. Step 5: Solve for x
    x = 119,044,459,992.38/390,612.96
  6. Step 6: Final answer
    x = 304,763.21

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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.