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Finding the Fourth Proportional to 152.47, 210.45 and 90.31

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Solution

The fourth proportional to 152.47, 210.45 and 90.31 is: 124.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    152.47 : 210.45 = 90.31 : x
  2. Step 2: Convert to fraction form
    152.47/210.45 = 90.31/x
  3. Step 3: Cross multiply
    152.47x = 210.45 × 90.31
  4. Step 4: Simplify right side
    152.47x = 19,005.74
  5. Step 5: Solve for x
    x = 19,005.74/152.47
  6. Step 6: Final answer
    x = 124.65

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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.