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Finding the Fourth Proportional to 1,623.68, 2,240.64 and 915.59

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Solution

The fourth proportional to 1,623.68, 2,240.64 and 915.59 is: 1,263.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,623.68 : 2,240.64 = 915.59 : x
  2. Step 2: Convert to fraction form
    1,623.68/2,240.64 = 915.59/x
  3. Step 3: Cross multiply
    1,623.68x = 2,240.64 × 915.59
  4. Step 4: Simplify right side
    1,623.68x = 2,051,496.37
  5. Step 5: Solve for x
    x = 2,051,496.37/1,623.68
  6. Step 6: Final answer
    x = 1,263.49

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1.5x scale

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.