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Finding the Fourth Proportional to 1,368.75, 1,888.89 and 747.75

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Solution

The fourth proportional to 1,368.75, 1,888.89 and 747.75 is: 1,031.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,368.75 : 1,888.89 = 747.75 : x
  2. Step 2: Convert to fraction form
    1,368.75/1,888.89 = 747.75/x
  3. Step 3: Cross multiply
    1,368.75x = 1,888.89 × 747.75
  4. Step 4: Simplify right side
    1,368.75x = 1,412,417.50
  5. Step 5: Solve for x
    x = 1,412,417.50/1,368.75
  6. Step 6: Final answer
    x = 1,031.90

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Half scale
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Double scale
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1.5x scale

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.