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Finding the Fourth Proportional to 783, 1,079.55 and 626.16

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Solution

The fourth proportional to 783, 1,079.55 and 626.16 is: 863.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    783 : 1,079.55 = 626.16 : x
  2. Step 2: Convert to fraction form
    783/1,079.55 = 626.16/x
  3. Step 3: Cross multiply
    783x = 1,079.55 × 626.16
  4. Step 4: Simplify right side
    783x = 675,971.03
  5. Step 5: Solve for x
    x = 675,971.03/783
  6. Step 6: Final answer
    x = 863.31

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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.