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Finding the Fourth Proportional to 1,929.76, 2,662.08 and 1,230.40

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Solution

The fourth proportional to 1,929.76, 2,662.08 and 1,230.40 is: 1,697.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,929.76 : 2,662.08 = 1,230.40 : x
  2. Step 2: Convert to fraction form
    1,929.76/2,662.08 = 1,230.40/x
  3. Step 3: Cross multiply
    1,929.76x = 2,662.08 × 1,230.40
  4. Step 4: Simplify right side
    1,929.76x = 3,275,423.23
  5. Step 5: Solve for x
    x = 3,275,423.23/1,929.76
  6. Step 6: Final answer
    x = 1,697.32

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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.