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Finding the Fourth Proportional to 1,070.40, 1,603.20 and 556.80

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Solution

The fourth proportional to 1,070.40, 1,603.20 and 556.80 is: 833.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,070.40 : 1,603.20 = 556.80 : x
  2. Step 2: Convert to fraction form
    1,070.40/1,603.20 = 556.80/x
  3. Step 3: Cross multiply
    1,070.40x = 1,603.20 × 556.80
  4. Step 4: Simplify right side
    1,070.40x = 892,661.76
  5. Step 5: Solve for x
    x = 892,661.76/1,070.40
  6. Step 6: Final answer
    x = 833.95

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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.