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Finding the Fourth Proportional to 662,889.81, 914,744.88 and 390,895.36

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Solution

The fourth proportional to 662,889.81, 914,744.88 and 390,895.36 is: 539,410.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    662,889.81 : 914,744.88 = 390,895.36 : x
  2. Step 2: Convert to fraction form
    662,889.81/914,744.88 = 390,895.36/x
  3. Step 3: Cross multiply
    662,889.81x = 914,744.88 × 390,895.36
  4. Step 4: Simplify right side
    662,889.81x = 357,569,529,175.76
  5. Step 5: Solve for x
    x = 357,569,529,175.76/662,889.81
  6. Step 6: Final answer
    x = 539,410.21

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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.