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Finding the Fourth Proportional to 1,308.47, 1,805.65 and 718.99

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Solution

The fourth proportional to 1,308.47, 1,805.65 and 718.99 is: 992.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,308.47 : 1,805.65 = 718.99 : x
  2. Step 2: Convert to fraction form
    1,308.47/1,805.65 = 718.99/x
  3. Step 3: Cross multiply
    1,308.47x = 1,805.65 × 718.99
  4. Step 4: Simplify right side
    1,308.47x = 1,298,237.98
  5. Step 5: Solve for x
    x = 1,298,237.98/1,308.47
  6. Step 6: Final answer
    x = 992.18

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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.