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Finding the Fourth Proportional to 877.49, 1,316.27 and 390.54

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Solution

The fourth proportional to 877.49, 1,316.27 and 390.54 is: 585.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    877.49 : 1,316.27 = 390.54 : x
  2. Step 2: Convert to fraction form
    877.49/1,316.27 = 390.54/x
  3. Step 3: Cross multiply
    877.49x = 1,316.27 × 390.54
  4. Step 4: Simplify right side
    877.49x = 514,057.06
  5. Step 5: Solve for x
    x = 514,057.06/877.49
  6. Step 6: Final answer
    x = 585.83

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Half scale
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Double scale
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Similar ratio
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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.