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Finding the Fourth Proportional to 390,304.32, 538,612.94 and 220,534.80

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Solution

The fourth proportional to 390,304.32, 538,612.94 and 220,534.80 is: 304,334.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,304.32 : 538,612.94 = 220,534.80 : x
  2. Step 2: Convert to fraction form
    390,304.32/538,612.94 = 220,534.80/x
  3. Step 3: Cross multiply
    390,304.32x = 538,612.94 × 220,534.80
  4. Step 4: Simplify right side
    390,304.32x = 118,782,897,000.31
  5. Step 5: Solve for x
    x = 118,782,897,000.31/390,304.32
  6. Step 6: Final answer
    x = 304,334.06

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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.