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Finding the Fourth Proportional to 817.03, 1,127.51 and 485.45

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Solution

The fourth proportional to 817.03, 1,127.51 and 485.45 is: 669.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.03 : 1,127.51 = 485.45 : x
  2. Step 2: Convert to fraction form
    817.03/1,127.51 = 485.45/x
  3. Step 3: Cross multiply
    817.03x = 1,127.51 × 485.45
  4. Step 4: Simplify right side
    817.03x = 547,349.73
  5. Step 5: Solve for x
    x = 547,349.73/817.03
  6. Step 6: Final answer
    x = 669.93

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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.