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Finding the Fourth Proportional to 802.90, 1,203.43 and 339.99

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Solution

The fourth proportional to 802.90, 1,203.43 and 339.99 is: 509.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    802.90 : 1,203.43 = 339.99 : x
  2. Step 2: Convert to fraction form
    802.90/1,203.43 = 339.99/x
  3. Step 3: Cross multiply
    802.90x = 1,203.43 × 339.99
  4. Step 4: Simplify right side
    802.90x = 409,154.17
  5. Step 5: Solve for x
    x = 409,154.17/802.90
  6. Step 6: Final answer
    x = 509.60

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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.