Home / 78,002.10-117,003.15-70,128.90

Finding the Fourth Proportional to 78,002.10, 117,003.15 and 70,128.90

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Solution

The fourth proportional to 78,002.10, 117,003.15 and 70,128.90 is: 105,193.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,002.10 : 117,003.15 = 70,128.90 : x
  2. Step 2: Convert to fraction form
    78,002.10/117,003.15 = 70,128.90/x
  3. Step 3: Cross multiply
    78,002.10x = 117,003.15 × 70,128.90
  4. Step 4: Simplify right side
    78,002.10x = 8,205,302,206.04
  5. Step 5: Solve for x
    x = 8,205,302,206.04/78,002.10
  6. Step 6: Final answer
    x = 105,193.35

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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.