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Finding the Fourth Proportional to 305,639.16, 421,807.02 and 169,681.40

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Solution

The fourth proportional to 305,639.16, 421,807.02 and 169,681.40 is: 234,174.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    305,639.16 : 421,807.02 = 169,681.40 : x
  2. Step 2: Convert to fraction form
    305,639.16/421,807.02 = 169,681.40/x
  3. Step 3: Cross multiply
    305,639.16x = 421,807.02 × 169,681.40
  4. Step 4: Simplify right side
    305,639.16x = 71,572,805,683.43
  5. Step 5: Solve for x
    x = 71,572,805,683.43/305,639.16
  6. Step 6: Final answer
    x = 234,174.20

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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.