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Finding the Fourth Proportional to 738.75, 1,016.91 and 639.12

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Solution

The fourth proportional to 738.75, 1,016.91 and 639.12 is: 879.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    738.75 : 1,016.91 = 639.12 : x
  2. Step 2: Convert to fraction form
    738.75/1,016.91 = 639.12/x
  3. Step 3: Cross multiply
    738.75x = 1,016.91 × 639.12
  4. Step 4: Simplify right side
    738.75x = 649,927.52
  5. Step 5: Solve for x
    x = 649,927.52/738.75
  6. Step 6: Final answer
    x = 879.77

Related Problems

Find fourth proportional to 369.38, 508.46 and 319.56
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.