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Finding the Fourth Proportional to 1,070.98, 1,477.11 and 678.13

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Solution

The fourth proportional to 1,070.98, 1,477.11 and 678.13 is: 935.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,070.98 : 1,477.11 = 678.13 : x
  2. Step 2: Convert to fraction form
    1,070.98/1,477.11 = 678.13/x
  3. Step 3: Cross multiply
    1,070.98x = 1,477.11 × 678.13
  4. Step 4: Simplify right side
    1,070.98x = 1,001,672.60
  5. Step 5: Solve for x
    x = 1,001,672.60/1,070.98
  6. Step 6: Final answer
    x = 935.29

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1.5x scale

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.