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Finding the Fourth Proportional to 390,787.52, 539,290.40 and 229,646.08

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Solution

The fourth proportional to 390,787.52, 539,290.40 and 229,646.08 is: 316,913.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,787.52 : 539,290.40 = 229,646.08 : x
  2. Step 2: Convert to fraction form
    390,787.52/539,290.40 = 229,646.08/x
  3. Step 3: Cross multiply
    390,787.52x = 539,290.40 × 229,646.08
  4. Step 4: Simplify right side
    390,787.52x = 123,845,926,341.63
  5. Step 5: Solve for x
    x = 123,845,926,341.63/390,787.52
  6. Step 6: Final answer
    x = 316,913.72

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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.