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Finding the Fourth Proportional to 72,876.69, 100,358.09 and 63,312.21

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Solution

The fourth proportional to 72,876.69, 100,358.09 and 63,312.21 is: 87,186.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,876.69 : 100,358.09 = 63,312.21 : x
  2. Step 2: Convert to fraction form
    72,876.69/100,358.09 = 63,312.21/x
  3. Step 3: Cross multiply
    72,876.69x = 100,358.09 × 63,312.21
  4. Step 4: Simplify right side
    72,876.69x = 6,353,892,152.72
  5. Step 5: Solve for x
    x = 6,353,892,152.72/72,876.69
  6. Step 6: Final answer
    x = 87,186.89

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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.