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Finding the Fourth Proportional to 1,570.62, 2,354.70 and 790.21

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Solution

The fourth proportional to 1,570.62, 2,354.70 and 790.21 is: 1,184.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,570.62 : 2,354.70 = 790.21 : x
  2. Step 2: Convert to fraction form
    1,570.62/2,354.70 = 790.21/x
  3. Step 3: Cross multiply
    1,570.62x = 2,354.70 × 790.21
  4. Step 4: Simplify right side
    1,570.62x = 1,860,707.49
  5. Step 5: Solve for x
    x = 1,860,707.49/1,570.62
  6. Step 6: Final answer
    x = 1,184.70

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.