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Finding the Fourth Proportional to 923.70, 1,385.55 and 802.20

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Solution

The fourth proportional to 923.70, 1,385.55 and 802.20 is: 1,203.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    923.70 : 1,385.55 = 802.20 : x
  2. Step 2: Convert to fraction form
    923.70/1,385.55 = 802.20/x
  3. Step 3: Cross multiply
    923.70x = 1,385.55 × 802.20
  4. Step 4: Simplify right side
    923.70x = 1,111,488.21
  5. Step 5: Solve for x
    x = 1,111,488.21/923.70
  6. Step 6: Final answer
    x = 1,203.30

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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.