Home / 85,572,186.80-128,358,280.20-81,391,809.20

Finding the Fourth Proportional to 85,572,186.80, 128,358,280.20 and 81,391,809.20

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Solution

The fourth proportional to 85,572,186.80, 128,358,280.20 and 81,391,809.20 is: 122,087,713.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,572,186.80 : 128,358,280.20 = 81,391,809.20 : x
  2. Step 2: Convert to fraction form
    85,572,186.80/128,358,280.20 = 81,391,809.20/x
  3. Step 3: Cross multiply
    85,572,186.80x = 128,358,280.20 × 81,391,809.20
  4. Step 4: Simplify right side
    85,572,186.80x = 10,447,312,651,278,538
  5. Step 5: Solve for x
    x = 10,447,312,651,278,538/85,572,186.80
  6. Step 6: Final answer
    x = 122,087,713.80

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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.