Home / 858,378.60-1,287,567.90-259,432.20

Finding the Fourth Proportional to 858,378.60, 1,287,567.90 and 259,432.20

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Solution

The fourth proportional to 858,378.60, 1,287,567.90 and 259,432.20 is: 389,148.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    858,378.60 : 1,287,567.90 = 259,432.20 : x
  2. Step 2: Convert to fraction form
    858,378.60/1,287,567.90 = 259,432.20/x
  3. Step 3: Cross multiply
    858,378.60x = 1,287,567.90 × 259,432.20
  4. Step 4: Simplify right side
    858,378.60x = 334,036,572,946.38
  5. Step 5: Solve for x
    x = 334,036,572,946.38/858,378.60
  6. Step 6: Final answer
    x = 389,148.30

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Double scale
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Similar ratio
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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.