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Finding the Fourth Proportional to 125.25, 172.85 and 70.00

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Solution

The fourth proportional to 125.25, 172.85 and 70.00 is: 96.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    125.25 : 172.85 = 70.00 : x
  2. Step 2: Convert to fraction form
    125.25/172.85 = 70.00/x
  3. Step 3: Cross multiply
    125.25x = 172.85 × 70.00
  4. Step 4: Simplify right side
    125.25x = 12,098.29
  5. Step 5: Solve for x
    x = 12,098.29/125.25
  6. Step 6: Final answer
    x = 96.60

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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.