Home / 90,038.20-134,879.10-78,957.40

Finding the Fourth Proportional to 90,038.20, 134,879.10 and 78,957.40

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Solution

The fourth proportional to 90,038.20, 134,879.10 and 78,957.40 is: 118,279.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,038.20 : 134,879.10 = 78,957.40 : x
  2. Step 2: Convert to fraction form
    90,038.20/134,879.10 = 78,957.40/x
  3. Step 3: Cross multiply
    90,038.20x = 134,879.10 × 78,957.40
  4. Step 4: Simplify right side
    90,038.20x = 10,649,703,050.34
  5. Step 5: Solve for x
    x = 10,649,703,050.34/90,038.20
  6. Step 6: Final answer
    x = 118,279.83

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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.