Home / 1,917.12-2,646.15-1,121.13

Finding the Fourth Proportional to 1,917.12, 2,646.15 and 1,121.13

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Solution

The fourth proportional to 1,917.12, 2,646.15 and 1,121.13 is: 1,547.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,917.12 : 2,646.15 = 1,121.13 : x
  2. Step 2: Convert to fraction form
    1,917.12/2,646.15 = 1,121.13/x
  3. Step 3: Cross multiply
    1,917.12x = 2,646.15 × 1,121.13
  4. Step 4: Simplify right side
    1,917.12x = 2,966,678.15
  5. Step 5: Solve for x
    x = 2,966,678.15/1,917.12
  6. Step 6: Final answer
    x = 1,547.47

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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.