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Finding the Fourth Proportional to 287.02, 430.70 and 157.08

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Solution

The fourth proportional to 287.02, 430.70 and 157.08 is: 235.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.02 : 430.70 = 157.08 : x
  2. Step 2: Convert to fraction form
    287.02/430.70 = 157.08/x
  3. Step 3: Cross multiply
    287.02x = 430.70 × 157.08
  4. Step 4: Simplify right side
    287.02x = 67,654.86
  5. Step 5: Solve for x
    x = 67,654.86/287.02
  6. Step 6: Final answer
    x = 235.72

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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.