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Finding the Fourth Proportional to 926.20, 1,389.40 and 309.88

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Solution

The fourth proportional to 926.20, 1,389.40 and 309.88 is: 464.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    926.20 : 1,389.40 = 309.88 : x
  2. Step 2: Convert to fraction form
    926.20/1,389.40 = 309.88/x
  3. Step 3: Cross multiply
    926.20x = 1,389.40 × 309.88
  4. Step 4: Simplify right side
    926.20x = 430,547.27
  5. Step 5: Solve for x
    x = 430,547.27/926.20
  6. Step 6: Final answer
    x = 464.85

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1.5x scale

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.