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Finding the Fourth Proportional to 86,478.40, 129,721.47 and 26,502.53

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Solution

The fourth proportional to 86,478.40, 129,721.47 and 26,502.53 is: 39,754.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,478.40 : 129,721.47 = 26,502.53 : x
  2. Step 2: Convert to fraction form
    86,478.40/129,721.47 = 26,502.53/x
  3. Step 3: Cross multiply
    86,478.40x = 129,721.47 × 26,502.53
  4. Step 4: Simplify right side
    86,478.40x = 3,437,947,017.81
  5. Step 5: Solve for x
    x = 3,437,947,017.81/86,478.40
  6. Step 6: Final answer
    x = 39,754.98

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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.