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Finding the Fourth Proportional to 1,070.78, 1,477.62 and 605

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Solution

The fourth proportional to 1,070.78, 1,477.62 and 605 is: 834.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,070.78 : 1,477.62 = 605 : x
  2. Step 2: Convert to fraction form
    1,070.78/1,477.62 = 605/x
  3. Step 3: Cross multiply
    1,070.78x = 1,477.62 × 605
  4. Step 4: Simplify right side
    1,070.78x = 893,960.10
  5. Step 5: Solve for x
    x = 893,960.10/1,070.78
  6. Step 6: Final answer
    x = 834.87

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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.