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Finding the Fourth Proportional to 858,978.90, 1,288,140.30 and 259,740.90

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Solution

The fourth proportional to 858,978.90, 1,288,140.30 and 259,740.90 is: 389,512.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    858,978.90 : 1,288,140.30 = 259,740.90 : x
  2. Step 2: Convert to fraction form
    858,978.90/1,288,140.30 = 259,740.90/x
  3. Step 3: Cross multiply
    858,978.90x = 1,288,140.30 × 259,740.90
  4. Step 4: Simplify right side
    858,978.90x = 334,582,720,848.27
  5. Step 5: Solve for x
    x = 334,582,720,848.27/858,978.90
  6. Step 6: Final answer
    x = 389,512.15

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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.