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Finding the Fourth Proportional to 90,420.64, 124,787.28 and 52,686.88

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Solution

The fourth proportional to 90,420.64, 124,787.28 and 52,686.88 is: 72,711.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,420.64 : 124,787.28 = 52,686.88 : x
  2. Step 2: Convert to fraction form
    90,420.64/124,787.28 = 52,686.88/x
  3. Step 3: Cross multiply
    90,420.64x = 124,787.28 × 52,686.88
  4. Step 4: Simplify right side
    90,420.64x = 6,574,652,446.89
  5. Step 5: Solve for x
    x = 6,574,652,446.89/90,420.64
  6. Step 6: Final answer
    x = 72,711.85

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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.