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Finding the Fourth Proportional to 875.48, 1,208.49 and 665.69

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Solution

The fourth proportional to 875.48, 1,208.49 and 665.69 is: 918.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.48 : 1,208.49 = 665.69 : x
  2. Step 2: Convert to fraction form
    875.48/1,208.49 = 665.69/x
  3. Step 3: Cross multiply
    875.48x = 1,208.49 × 665.69
  4. Step 4: Simplify right side
    875.48x = 804,479.71
  5. Step 5: Solve for x
    x = 804,479.71/875.48
  6. Step 6: Final answer
    x = 918.90

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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.