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Finding the Fourth Proportional to 990.03, 1,485.06 and 340.75

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Solution

The fourth proportional to 990.03, 1,485.06 and 340.75 is: 511.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.03 : 1,485.06 = 340.75 : x
  2. Step 2: Convert to fraction form
    990.03/1,485.06 = 340.75/x
  3. Step 3: Cross multiply
    990.03x = 1,485.06 × 340.75
  4. Step 4: Simplify right side
    990.03x = 506,034.20
  5. Step 5: Solve for x
    x = 506,034.20/990.03
  6. Step 6: Final answer
    x = 511.13

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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 (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.