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Finding the Fourth Proportional to 78,859.80, 118,289.70 and 74,971.80

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Solution

The fourth proportional to 78,859.80, 118,289.70 and 74,971.80 is: 112,457.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,859.80 : 118,289.70 = 74,971.80 : x
  2. Step 2: Convert to fraction form
    78,859.80/118,289.70 = 74,971.80/x
  3. Step 3: Cross multiply
    78,859.80x = 118,289.70 × 74,971.80
  4. Step 4: Simplify right side
    78,859.80x = 8,868,391,730.46
  5. Step 5: Solve for x
    x = 8,868,391,730.46/78,859.80
  6. Step 6: Final answer
    x = 112,457.70

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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.