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Finding the Fourth Proportional to 100,038.88, 137,988.58 and 64,172.08

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Solution

The fourth proportional to 100,038.88, 137,988.58 and 64,172.08 is: 88,515.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,038.88 : 137,988.58 = 64,172.08 : x
  2. Step 2: Convert to fraction form
    100,038.88/137,988.58 = 64,172.08/x
  3. Step 3: Cross multiply
    100,038.88x = 137,988.58 × 64,172.08
  4. Step 4: Simplify right side
    100,038.88x = 8,855,014,194.85
  5. Step 5: Solve for x
    x = 8,855,014,194.85/100,038.88
  6. Step 6: Final answer
    x = 88,515.73

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.