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Finding the Fourth Proportional to 390,686.91, 539,217 and 229,541.91

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Solution

The fourth proportional to 390,686.91, 539,217 and 229,541.91 is: 316,808.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,686.91 : 539,217 = 229,541.91 : x
  2. Step 2: Convert to fraction form
    390,686.91/539,217 = 229,541.91/x
  3. Step 3: Cross multiply
    390,686.91x = 539,217 × 229,541.91
  4. Step 4: Simplify right side
    390,686.91x = 123,772,900,084.47
  5. Step 5: Solve for x
    x = 123,772,900,084.47/390,686.91
  6. Step 6: Final answer
    x = 316,808.41

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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.