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Finding the Fourth Proportional to 78,658.74, 117,988.11 and 28,740.06

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Solution

The fourth proportional to 78,658.74, 117,988.11 and 28,740.06 is: 43,110.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,658.74 : 117,988.11 = 28,740.06 : x
  2. Step 2: Convert to fraction form
    78,658.74/117,988.11 = 28,740.06/x
  3. Step 3: Cross multiply
    78,658.74x = 117,988.11 × 28,740.06
  4. Step 4: Simplify right side
    78,658.74x = 3,390,985,360.69
  5. Step 5: Solve for x
    x = 3,390,985,360.69/78,658.74
  6. Step 6: Final answer
    x = 43,110.09

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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.