Home / 81,931.78-122,927.28-28,631.65

Finding the Fourth Proportional to 81,931.78, 122,927.28 and 28,631.65

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Solution

The fourth proportional to 81,931.78, 122,927.28 and 28,631.65 is: 42,957.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,931.78 : 122,927.28 = 28,631.65 : x
  2. Step 2: Convert to fraction form
    81,931.78/122,927.28 = 28,631.65/x
  3. Step 3: Cross multiply
    81,931.78x = 122,927.28 × 28,631.65
  4. Step 4: Simplify right side
    81,931.78x = 3,519,610,856.41
  5. Step 5: Solve for x
    x = 3,519,610,856.41/81,931.78
  6. Step 6: Final answer
    x = 42,957.82

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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.