Home / 1,317.40-1,971.54-1,056.78

Finding the Fourth Proportional to 1,317.40, 1,971.54 and 1,056.78

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Solution

The fourth proportional to 1,317.40, 1,971.54 and 1,056.78 is: 1,581.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,317.40 : 1,971.54 = 1,056.78 : x
  2. Step 2: Convert to fraction form
    1,317.40/1,971.54 = 1,056.78/x
  3. Step 3: Cross multiply
    1,317.40x = 1,971.54 × 1,056.78
  4. Step 4: Simplify right side
    1,317.40x = 2,083,484.04
  5. Step 5: Solve for x
    x = 2,083,484.04/1,317.40
  6. Step 6: Final answer
    x = 1,581.52

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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.