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Finding the Fourth Proportional to 85,939.70, 128,909.55 and 49,075.70

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Solution

The fourth proportional to 85,939.70, 128,909.55 and 49,075.70 is: 73,613.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,939.70 : 128,909.55 = 49,075.70 : x
  2. Step 2: Convert to fraction form
    85,939.70/128,909.55 = 49,075.70/x
  3. Step 3: Cross multiply
    85,939.70x = 128,909.55 × 49,075.70
  4. Step 4: Simplify right side
    85,939.70x = 6,326,326,402.94
  5. Step 5: Solve for x
    x = 6,326,326,402.94/85,939.70
  6. Step 6: Final answer
    x = 73,613.55

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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.