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Finding the Fourth Proportional to 1,328.99, 1,995.30 and 917.10

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Solution

The fourth proportional to 1,328.99, 1,995.30 and 917.10 is: 1,376.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,328.99 : 1,995.30 = 917.10 : x
  2. Step 2: Convert to fraction form
    1,328.99/1,995.30 = 917.10/x
  3. Step 3: Cross multiply
    1,328.99x = 1,995.30 × 917.10
  4. Step 4: Simplify right side
    1,328.99x = 1,829,889.63
  5. Step 5: Solve for x
    x = 1,829,889.63/1,328.99
  6. Step 6: Final answer
    x = 1,376.91

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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.