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Finding the Fourth Proportional to 875.16, 1,313.28 and 485.46

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Solution

The fourth proportional to 875.16, 1,313.28 and 485.46 is: 728.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.16 : 1,313.28 = 485.46 : x
  2. Step 2: Convert to fraction form
    875.16/1,313.28 = 485.46/x
  3. Step 3: Cross multiply
    875.16x = 1,313.28 × 485.46
  4. Step 4: Simplify right side
    875.16x = 637,544.91
  5. Step 5: Solve for x
    x = 637,544.91/875.16
  6. Step 6: Final answer
    x = 728.49

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Double scale
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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.