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Finding the Fourth Proportional to 1,004.80, 1,386.48 and 655.60

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Solution

The fourth proportional to 1,004.80, 1,386.48 and 655.60 is: 904.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,004.80 : 1,386.48 = 655.60 : x
  2. Step 2: Convert to fraction form
    1,004.80/1,386.48 = 655.60/x
  3. Step 3: Cross multiply
    1,004.80x = 1,386.48 × 655.60
  4. Step 4: Simplify right side
    1,004.80x = 908,976.29
  5. Step 5: Solve for x
    x = 908,976.29/1,004.80
  6. Step 6: Final answer
    x = 904.63

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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.