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Finding the Fourth Proportional to 670.47, 1,005.69 and 346.05

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Solution

The fourth proportional to 670.47, 1,005.69 and 346.05 is: 519.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    670.47 : 1,005.69 = 346.05 : x
  2. Step 2: Convert to fraction form
    670.47/1,005.69 = 346.05/x
  3. Step 3: Cross multiply
    670.47x = 1,005.69 × 346.05
  4. Step 4: Simplify right side
    670.47x = 348,019.02
  5. Step 5: Solve for x
    x = 348,019.02/670.47
  6. Step 6: Final answer
    x = 519.07

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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.