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Finding the Fourth Proportional to 1,070.36, 1,603.76 and 420.72

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Solution

The fourth proportional to 1,070.36, 1,603.76 and 420.72 is: 630.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,070.36 : 1,603.76 = 420.72 : x
  2. Step 2: Convert to fraction form
    1,070.36/1,603.76 = 420.72/x
  3. Step 3: Cross multiply
    1,070.36x = 1,603.76 × 420.72
  4. Step 4: Simplify right side
    1,070.36x = 674,733.91
  5. Step 5: Solve for x
    x = 674,733.91/1,070.36
  6. Step 6: Final answer
    x = 630.38

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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.