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Finding the Fourth Proportional to 1,931.90, 2,897.84 and 699.30

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Solution

The fourth proportional to 1,931.90, 2,897.84 and 699.30 is: 1,048.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,931.90 : 2,897.84 = 699.30 : x
  2. Step 2: Convert to fraction form
    1,931.90/2,897.84 = 699.30/x
  3. Step 3: Cross multiply
    1,931.90x = 2,897.84 × 699.30
  4. Step 4: Simplify right side
    1,931.90x = 2,026,459.51
  5. Step 5: Solve for x
    x = 2,026,459.51/1,931.90
  6. Step 6: Final answer
    x = 1,048.95

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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.