Home / 1,398.86-2,095.55-1,278.57

Finding the Fourth Proportional to 1,398.86, 2,095.55 and 1,278.57

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Solution

The fourth proportional to 1,398.86, 2,095.55 and 1,278.57 is: 1,915.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,398.86 : 2,095.55 = 1,278.57 : x
  2. Step 2: Convert to fraction form
    1,398.86/2,095.55 = 1,278.57/x
  3. Step 3: Cross multiply
    1,398.86x = 2,095.55 × 1,278.57
  4. Step 4: Simplify right side
    1,398.86x = 2,679,307.36
  5. Step 5: Solve for x
    x = 2,679,307.36/1,398.86
  6. Step 6: Final answer
    x = 1,915.35

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.