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Finding the Fourth Proportional to 877.50, 1,315.98 and 657.72

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Solution

The fourth proportional to 877.50, 1,315.98 and 657.72 is: 986.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    877.50 : 1,315.98 = 657.72 : x
  2. Step 2: Convert to fraction form
    877.50/1,315.98 = 657.72/x
  3. Step 3: Cross multiply
    877.50x = 1,315.98 × 657.72
  4. Step 4: Simplify right side
    877.50x = 865,546.37
  5. Step 5: Solve for x
    x = 865,546.37/877.50
  6. Step 6: Final answer
    x = 986.38

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.