Home / 1,312.19-1,968.57-618.86

Finding the Fourth Proportional to 1,312.19, 1,968.57 and 618.86

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Solution

The fourth proportional to 1,312.19, 1,968.57 and 618.86 is: 928.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,312.19 : 1,968.57 = 618.86 : x
  2. Step 2: Convert to fraction form
    1,312.19/1,968.57 = 618.86/x
  3. Step 3: Cross multiply
    1,312.19x = 1,968.57 × 618.86
  4. Step 4: Simplify right side
    1,312.19x = 1,218,269.23
  5. Step 5: Solve for x
    x = 1,218,269.23/1,312.19
  6. Step 6: Final answer
    x = 928.42

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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.