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Finding the Fourth Proportional to 1,004.55, 1,386.63 and 709.98

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Solution

The fourth proportional to 1,004.55, 1,386.63 and 709.98 is: 980.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,004.55 : 1,386.63 = 709.98 : x
  2. Step 2: Convert to fraction form
    1,004.55/1,386.63 = 709.98/x
  3. Step 3: Cross multiply
    1,004.55x = 1,386.63 × 709.98
  4. Step 4: Simplify right side
    1,004.55x = 984,479.57
  5. Step 5: Solve for x
    x = 984,479.57/1,004.55
  6. Step 6: Final answer
    x = 980.02

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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.