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Finding the Fourth Proportional to 1,070.79, 1,477.69 and 628.70

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Solution

The fourth proportional to 1,070.79, 1,477.69 and 628.70 is: 867.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,070.79 : 1,477.69 = 628.70 : x
  2. Step 2: Convert to fraction form
    1,070.79/1,477.69 = 628.70/x
  3. Step 3: Cross multiply
    1,070.79x = 1,477.69 × 628.70
  4. Step 4: Simplify right side
    1,070.79x = 929,018.28
  5. Step 5: Solve for x
    x = 929,018.28/1,070.79
  6. Step 6: Final answer
    x = 867.60

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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.