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Finding the Fourth Proportional to 86,656.76, 129,985.12 and 31,252.76

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Solution

The fourth proportional to 86,656.76, 129,985.12 and 31,252.76 is: 46,879.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,656.76 : 129,985.12 = 31,252.76 : x
  2. Step 2: Convert to fraction form
    86,656.76/129,985.12 = 31,252.76/x
  3. Step 3: Cross multiply
    86,656.76x = 129,985.12 × 31,252.76
  4. Step 4: Simplify right side
    86,656.76x = 4,062,393,758.93
  5. Step 5: Solve for x
    x = 4,062,393,758.93/86,656.76
  6. Step 6: Final answer
    x = 46,879.13

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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.