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Finding the Fourth Proportional to 1,019.90, 1,407.16 and 704.79

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Solution

The fourth proportional to 1,019.90, 1,407.16 and 704.79 is: 972.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,019.90 : 1,407.16 = 704.79 : x
  2. Step 2: Convert to fraction form
    1,019.90/1,407.16 = 704.79/x
  3. Step 3: Cross multiply
    1,019.90x = 1,407.16 × 704.79
  4. Step 4: Simplify right side
    1,019.90x = 991,755.77
  5. Step 5: Solve for x
    x = 991,755.77/1,019.90
  6. Step 6: Final answer
    x = 972.40

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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.