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Finding the Fourth Proportional to 56,290.59, 77,679.93 and 31,140.09

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Solution

The fourth proportional to 56,290.59, 77,679.93 and 31,140.09 is: 42,972.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    56,290.59 : 77,679.93 = 31,140.09 : x
  2. Step 2: Convert to fraction form
    56,290.59/77,679.93 = 31,140.09/x
  3. Step 3: Cross multiply
    56,290.59x = 77,679.93 × 31,140.09
  4. Step 4: Simplify right side
    56,290.59x = 2,418,960,011.39
  5. Step 5: Solve for x
    x = 2,418,960,011.39/56,290.59
  6. Step 6: Final answer
    x = 42,972.72

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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.