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Finding the Fourth Proportional to 285,040.76, 393,350.18 and 155,978.72

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Solution

The fourth proportional to 285,040.76, 393,350.18 and 155,978.72 is: 215,247.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    285,040.76 : 393,350.18 = 155,978.72 : x
  2. Step 2: Convert to fraction form
    285,040.76/393,350.18 = 155,978.72/x
  3. Step 3: Cross multiply
    285,040.76x = 393,350.18 × 155,978.72
  4. Step 4: Simplify right side
    285,040.76x = 61,354,255,621.42
  5. Step 5: Solve for x
    x = 61,354,255,621.42/285,040.76
  6. Step 6: Final answer
    x = 215,247.31

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.