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Finding the Fourth Proportional to 1,030.32, 1,420.74 and 680.40

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Solution

The fourth proportional to 1,030.32, 1,420.74 and 680.40 is: 938.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,030.32 : 1,420.74 = 680.40 : x
  2. Step 2: Convert to fraction form
    1,030.32/1,420.74 = 680.40/x
  3. Step 3: Cross multiply
    1,030.32x = 1,420.74 × 680.40
  4. Step 4: Simplify right side
    1,030.32x = 966,671.50
  5. Step 5: Solve for x
    x = 966,671.50/1,030.32
  6. Step 6: Final answer
    x = 938.22

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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.