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Finding the Fourth Proportional to 58,085.80, 87,128.70 and 56,919.40

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Solution

The fourth proportional to 58,085.80, 87,128.70 and 56,919.40 is: 85,379.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    58,085.80 : 87,128.70 = 56,919.40 : x
  2. Step 2: Convert to fraction form
    58,085.80/87,128.70 = 56,919.40/x
  3. Step 3: Cross multiply
    58,085.80x = 87,128.70 × 56,919.40
  4. Step 4: Simplify right side
    58,085.80x = 4,959,313,326.78
  5. Step 5: Solve for x
    x = 4,959,313,326.78/58,085.80
  6. Step 6: Final answer
    x = 85,379.10

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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.