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Finding the Fourth Proportional to 985.48, 1,477.20 and 492.28

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Solution

The fourth proportional to 985.48, 1,477.20 and 492.28 is: 737.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.48 : 1,477.20 = 492.28 : x
  2. Step 2: Convert to fraction form
    985.48/1,477.20 = 492.28/x
  3. Step 3: Cross multiply
    985.48x = 1,477.20 × 492.28
  4. Step 4: Simplify right side
    985.48x = 727,196.02
  5. Step 5: Solve for x
    x = 727,196.02/985.48
  6. Step 6: Final answer
    x = 737.91

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Double scale
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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.