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Finding the Fourth Proportional to 1,070.42, 1,605.38 and 339.89

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Solution

The fourth proportional to 1,070.42, 1,605.38 and 339.89 is: 509.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,070.42 : 1,605.38 = 339.89 : x
  2. Step 2: Convert to fraction form
    1,070.42/1,605.38 = 339.89/x
  3. Step 3: Cross multiply
    1,070.42x = 1,605.38 × 339.89
  4. Step 4: Simplify right side
    1,070.42x = 545,642.88
  5. Step 5: Solve for x
    x = 545,642.88/1,070.42
  6. Step 6: Final answer
    x = 509.75

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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.