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Finding the Fourth Proportional to 287.12, 430.40 and 156.98

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Solution

The fourth proportional to 287.12, 430.40 and 156.98 is: 235.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.12 : 430.40 = 156.98 : x
  2. Step 2: Convert to fraction form
    287.12/430.40 = 156.98/x
  3. Step 3: Cross multiply
    287.12x = 430.40 × 156.98
  4. Step 4: Simplify right side
    287.12x = 67,564.19
  5. Step 5: Solve for x
    x = 67,564.19/287.12
  6. Step 6: Final answer
    x = 235.32

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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.