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Finding the Fourth Proportional to 39,386.80, 59,059.80 and 11,681.20

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Solution

The fourth proportional to 39,386.80, 59,059.80 and 11,681.20 is: 17,515.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,386.80 : 59,059.80 = 11,681.20 : x
  2. Step 2: Convert to fraction form
    39,386.80/59,059.80 = 11,681.20/x
  3. Step 3: Cross multiply
    39,386.80x = 59,059.80 × 11,681.20
  4. Step 4: Simplify right side
    39,386.80x = 689,889,335.76
  5. Step 5: Solve for x
    x = 689,889,335.76/39,386.80
  6. Step 6: Final answer
    x = 17,515.75

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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.