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Finding the Fourth Proportional to 1,070.95, 1,478.06 and 678.01

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Solution

The fourth proportional to 1,070.95, 1,478.06 and 678.01 is: 935.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,070.95 : 1,478.06 = 678.01 : x
  2. Step 2: Convert to fraction form
    1,070.95/1,478.06 = 678.01/x
  3. Step 3: Cross multiply
    1,070.95x = 1,478.06 × 678.01
  4. Step 4: Simplify right side
    1,070.95x = 1,002,133.77
  5. Step 5: Solve for x
    x = 1,002,133.77/1,070.95
  6. Step 6: Final answer
    x = 935.75

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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.