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Finding the Fourth Proportional to 390,354.92, 538,675.80 and 220,585.40

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Solution

The fourth proportional to 390,354.92, 538,675.80 and 220,585.40 is: 304,399.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,354.92 : 538,675.80 = 220,585.40 : x
  2. Step 2: Convert to fraction form
    390,354.92/538,675.80 = 220,585.40/x
  3. Step 3: Cross multiply
    390,354.92x = 538,675.80 × 220,585.40
  4. Step 4: Simplify right side
    390,354.92x = 118,824,016,813.32
  5. Step 5: Solve for x
    x = 118,824,016,813.32/390,354.92
  6. Step 6: Final answer
    x = 304,399.95

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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.