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Finding the Fourth Proportional to 1,423.44, 1,964 and 802.40

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Solution

The fourth proportional to 1,423.44, 1,964 and 802.40 is: 1,107.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,423.44 : 1,964 = 802.40 : x
  2. Step 2: Convert to fraction form
    1,423.44/1,964 = 802.40/x
  3. Step 3: Cross multiply
    1,423.44x = 1,964 × 802.40
  4. Step 4: Simplify right side
    1,423.44x = 1,575,913.60
  5. Step 5: Solve for x
    x = 1,575,913.60/1,423.44
  6. Step 6: Final answer
    x = 1,107.12

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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.