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Finding the Fourth Proportional to 660.04, 990.40 and 478.93

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Solution

The fourth proportional to 660.04, 990.40 and 478.93 is: 718.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.04 : 990.40 = 478.93 : x
  2. Step 2: Convert to fraction form
    660.04/990.40 = 478.93/x
  3. Step 3: Cross multiply
    660.04x = 990.40 × 478.93
  4. Step 4: Simplify right side
    660.04x = 474,331.29
  5. Step 5: Solve for x
    x = 474,331.29/660.04
  6. Step 6: Final answer
    x = 718.64

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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.