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Finding the Fourth Proportional to 975.66, 1,347.42 and 808.20

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Solution

The fourth proportional to 975.66, 1,347.42 and 808.20 is: 1,116.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    975.66 : 1,347.42 = 808.20 : x
  2. Step 2: Convert to fraction form
    975.66/1,347.42 = 808.20/x
  3. Step 3: Cross multiply
    975.66x = 1,347.42 × 808.20
  4. Step 4: Simplify right side
    975.66x = 1,088,984.84
  5. Step 5: Solve for x
    x = 1,088,984.84/975.66
  6. Step 6: Final answer
    x = 1,116.15

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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.