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Finding the Fourth Proportional to 912.76, 1,259.94 and 715.48

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Solution

The fourth proportional to 912.76, 1,259.94 and 715.48 is: 987.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.76 : 1,259.94 = 715.48 : x
  2. Step 2: Convert to fraction form
    912.76/1,259.94 = 715.48/x
  3. Step 3: Cross multiply
    912.76x = 1,259.94 × 715.48
  4. Step 4: Simplify right side
    912.76x = 901,461.87
  5. Step 5: Solve for x
    x = 901,461.87/912.76
  6. Step 6: Final answer
    x = 987.62

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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.