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Finding the Fourth Proportional to 913,611, 1,260,751.56 and 505,730.64

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Solution

The fourth proportional to 913,611, 1,260,751.56 and 505,730.64 is: 697,890.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    913,611 : 1,260,751.56 = 505,730.64 : x
  2. Step 2: Convert to fraction form
    913,611/1,260,751.56 = 505,730.64/x
  3. Step 3: Cross multiply
    913,611x = 1,260,751.56 × 505,730.64
  4. Step 4: Simplify right side
    913,611x = 637,600,693,319.80
  5. Step 5: Solve for x
    x = 637,600,693,319.80/913,611
  6. Step 6: Final answer
    x = 697,890.78

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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.