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Finding the Fourth Proportional to 56,709.79, 78,259.79 and 31,218.71

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Solution

The fourth proportional to 56,709.79, 78,259.79 and 31,218.71 is: 43,081.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    56,709.79 : 78,259.79 = 31,218.71 : x
  2. Step 2: Convert to fraction form
    56,709.79/78,259.79 = 31,218.71/x
  3. Step 3: Cross multiply
    56,709.79x = 78,259.79 × 31,218.71
  4. Step 4: Simplify right side
    56,709.79x = 2,443,169,141.28
  5. Step 5: Solve for x
    x = 2,443,169,141.28/56,709.79
  6. Step 6: Final answer
    x = 43,081.97

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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.