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Finding the Fourth Proportional to 152.60, 210.30 and 115.70

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Solution

The fourth proportional to 152.60, 210.30 and 115.70 is: 159.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    152.60 : 210.30 = 115.70 : x
  2. Step 2: Convert to fraction form
    152.60/210.30 = 115.70/x
  3. Step 3: Cross multiply
    152.60x = 210.30 × 115.70
  4. Step 4: Simplify right side
    152.60x = 24,331.71
  5. Step 5: Solve for x
    x = 24,331.71/152.60
  6. Step 6: Final answer
    x = 159.45

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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.