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Finding the Fourth Proportional to 38,458.70, 57,655.65 and 19,990.70

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Solution

The fourth proportional to 38,458.70, 57,655.65 and 19,990.70 is: 29,969.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,458.70 : 57,655.65 = 19,990.70 : x
  2. Step 2: Convert to fraction form
    38,458.70/57,655.65 = 19,990.70/x
  3. Step 3: Cross multiply
    38,458.70x = 57,655.65 × 19,990.70
  4. Step 4: Simplify right side
    38,458.70x = 1,152,576,802.46
  5. Step 5: Solve for x
    x = 1,152,576,802.46/38,458.70
  6. Step 6: Final answer
    x = 29,969.21

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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.