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Finding the Fourth Proportional to 86,437.76, 129,660.76 and 42,011.60

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Solution

The fourth proportional to 86,437.76, 129,660.76 and 42,011.60 is: 63,019.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,437.76 : 129,660.76 = 42,011.60 : x
  2. Step 2: Convert to fraction form
    86,437.76/129,660.76 = 42,011.60/x
  3. Step 3: Cross multiply
    86,437.76x = 129,660.76 × 42,011.60
  4. Step 4: Simplify right side
    86,437.76x = 5,447,255,984.82
  5. Step 5: Solve for x
    x = 5,447,255,984.82/86,437.76
  6. Step 6: Final answer
    x = 63,019.40

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1.5x scale

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.