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Finding the Fourth Proportional to 78,312.40, 117,209.40 and 60,686.80

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Solution

The fourth proportional to 78,312.40, 117,209.40 and 60,686.80 is: 90,829.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,312.40 : 117,209.40 = 60,686.80 : x
  2. Step 2: Convert to fraction form
    78,312.40/117,209.40 = 60,686.80/x
  3. Step 3: Cross multiply
    78,312.40x = 117,209.40 × 60,686.80
  4. Step 4: Simplify right side
    78,312.40x = 7,113,063,415.92
  5. Step 5: Solve for x
    x = 7,113,063,415.92/78,312.40
  6. Step 6: Final answer
    x = 90,829.34

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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.