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Finding the Fourth Proportional to 1,638,434.16, 2,455,946.08 and 917,719.20

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Solution

The fourth proportional to 1,638,434.16, 2,455,946.08 and 917,719.20 is: 1,375,623.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,638,434.16 : 2,455,946.08 = 917,719.20 : x
  2. Step 2: Convert to fraction form
    1,638,434.16/2,455,946.08 = 917,719.20/x
  3. Step 3: Cross multiply
    1,638,434.16x = 2,455,946.08 × 917,719.20
  4. Step 4: Simplify right side
    1,638,434.16x = 2,253,868,854,912.41
  5. Step 5: Solve for x
    x = 2,253,868,854,912.41/1,638,434.16
  6. Step 6: Final answer
    x = 1,375,623.70

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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.