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Finding the Fourth Proportional to 39,678.71, 59,488.90 and 18,916.79

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Solution

The fourth proportional to 39,678.71, 59,488.90 and 18,916.79 is: 28,361.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,678.71 : 59,488.90 = 18,916.79 : x
  2. Step 2: Convert to fraction form
    39,678.71/59,488.90 = 18,916.79/x
  3. Step 3: Cross multiply
    39,678.71x = 59,488.90 × 18,916.79
  4. Step 4: Simplify right side
    39,678.71x = 1,125,338,683.89
  5. Step 5: Solve for x
    x = 1,125,338,683.89/39,678.71
  6. Step 6: Final answer
    x = 28,361.28

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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.