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Finding the Fourth Proportional to 85,853.20, 128,779.80 and 35,916.70

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Solution

The fourth proportional to 85,853.20, 128,779.80 and 35,916.70 is: 53,875.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,853.20 : 128,779.80 = 35,916.70 : x
  2. Step 2: Convert to fraction form
    85,853.20/128,779.80 = 35,916.70/x
  3. Step 3: Cross multiply
    85,853.20x = 128,779.80 × 35,916.70
  4. Step 4: Simplify right side
    85,853.20x = 4,625,345,442.66
  5. Step 5: Solve for x
    x = 4,625,345,442.66/85,853.20
  6. Step 6: Final answer
    x = 53,875.05

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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.