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Finding the Fourth Proportional to 912.99, 1,260.30 and 618.66

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Solution

The fourth proportional to 912.99, 1,260.30 and 618.66 is: 854.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.99 : 1,260.30 = 618.66 : x
  2. Step 2: Convert to fraction form
    912.99/1,260.30 = 618.66/x
  3. Step 3: Cross multiply
    912.99x = 1,260.30 × 618.66
  4. Step 4: Simplify right side
    912.99x = 779,697.20
  5. Step 5: Solve for x
    x = 779,697.20/912.99
  6. Step 6: Final answer
    x = 854.00

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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.