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Finding the Fourth Proportional to 285,491.88, 393,995.32 and 156,430.60

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Solution

The fourth proportional to 285,491.88, 393,995.32 and 156,430.60 is: 215,883.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    285,491.88 : 393,995.32 = 156,430.60 : x
  2. Step 2: Convert to fraction form
    285,491.88/393,995.32 = 156,430.60/x
  3. Step 3: Cross multiply
    285,491.88x = 393,995.32 × 156,430.60
  4. Step 4: Simplify right side
    285,491.88x = 61,632,924,304.79
  5. Step 5: Solve for x
    x = 61,632,924,304.79/285,491.88
  6. Step 6: Final answer
    x = 215,883.28

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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.