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Finding the Fourth Proportional to 56,490.40, 84,742.80 and 21,440.08

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Solution

The fourth proportional to 56,490.40, 84,742.80 and 21,440.08 is: 32,162.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    56,490.40 : 84,742.80 = 21,440.08 : x
  2. Step 2: Convert to fraction form
    56,490.40/84,742.80 = 21,440.08/x
  3. Step 3: Cross multiply
    56,490.40x = 84,742.80 × 21,440.08
  4. Step 4: Simplify right side
    56,490.40x = 1,816,892,411.42
  5. Step 5: Solve for x
    x = 1,816,892,411.42/56,490.40
  6. Step 6: Final answer
    x = 32,162.85

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.