Home / 127,430.10-191,145.15-85,439.70

Finding the Fourth Proportional to 127,430.10, 191,145.15 and 85,439.70

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Solution

The fourth proportional to 127,430.10, 191,145.15 and 85,439.70 is: 128,159.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    127,430.10 : 191,145.15 = 85,439.70 : x
  2. Step 2: Convert to fraction form
    127,430.10/191,145.15 = 85,439.70/x
  3. Step 3: Cross multiply
    127,430.10x = 191,145.15 × 85,439.70
  4. Step 4: Simplify right side
    127,430.10x = 16,331,384,272.46
  5. Step 5: Solve for x
    x = 16,331,384,272.46/127,430.10
  6. Step 6: Final answer
    x = 128,159.55

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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.