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Finding the Fourth Proportional to 1,078.68, 1,488.58 and 612.93

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Solution

The fourth proportional to 1,078.68, 1,488.58 and 612.93 is: 845.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,078.68 : 1,488.58 = 612.93 : x
  2. Step 2: Convert to fraction form
    1,078.68/1,488.58 = 612.93/x
  3. Step 3: Cross multiply
    1,078.68x = 1,488.58 × 612.93
  4. Step 4: Simplify right side
    1,078.68x = 912,395.34
  5. Step 5: Solve for x
    x = 912,395.34/1,078.68
  6. Step 6: Final answer
    x = 845.84

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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.