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Finding the Fourth Proportional to 56,721.70, 85,082.55 and 19,785.70

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Solution

The fourth proportional to 56,721.70, 85,082.55 and 19,785.70 is: 29,678.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    56,721.70 : 85,082.55 = 19,785.70 : x
  2. Step 2: Convert to fraction form
    56,721.70/85,082.55 = 19,785.70/x
  3. Step 3: Cross multiply
    56,721.70x = 85,082.55 × 19,785.70
  4. Step 4: Simplify right side
    56,721.70x = 1,683,417,809.54
  5. Step 5: Solve for x
    x = 1,683,417,809.54/56,721.70
  6. Step 6: Final answer
    x = 29,678.55

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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.