Home / 1,312.07-1,809.15-979.93

Finding the Fourth Proportional to 1,312.07, 1,809.15 and 979.93

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Solution

The fourth proportional to 1,312.07, 1,809.15 and 979.93 is: 1,351.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,312.07 : 1,809.15 = 979.93 : x
  2. Step 2: Convert to fraction form
    1,312.07/1,809.15 = 979.93/x
  3. Step 3: Cross multiply
    1,312.07x = 1,809.15 × 979.93
  4. Step 4: Simplify right side
    1,312.07x = 1,772,837.91
  5. Step 5: Solve for x
    x = 1,772,837.91/1,312.07
  6. Step 6: Final answer
    x = 1,351.18

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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.