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Finding the Fourth Proportional to 990.30, 1,366.61 and 548.19

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Solution

The fourth proportional to 990.30, 1,366.61 and 548.19 is: 756.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.30 : 1,366.61 = 548.19 : x
  2. Step 2: Convert to fraction form
    990.30/1,366.61 = 548.19/x
  3. Step 3: Cross multiply
    990.30x = 1,366.61 × 548.19
  4. Step 4: Simplify right side
    990.30x = 749,159.19
  5. Step 5: Solve for x
    x = 749,159.19/990.30
  6. Step 6: Final answer
    x = 756.50

Related Problems

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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.