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Finding the Fourth Proportional to 56,628.80, 78,140.95 and 31,130.96

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Solution

The fourth proportional to 56,628.80, 78,140.95 and 31,130.96 is: 42,956.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    56,628.80 : 78,140.95 = 31,130.96 : x
  2. Step 2: Convert to fraction form
    56,628.80/78,140.95 = 31,130.96/x
  3. Step 3: Cross multiply
    56,628.80x = 78,140.95 × 31,130.96
  4. Step 4: Simplify right side
    56,628.80x = 2,432,602,788.81
  5. Step 5: Solve for x
    x = 2,432,602,788.81/56,628.80
  6. Step 6: Final answer
    x = 42,956.99

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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.