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Finding the Fourth Proportional to 660,701.61, 911,611.40 and 388,781.37

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Solution

The fourth proportional to 660,701.61, 911,611.40 and 388,781.37 is: 536,426.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,701.61 : 911,611.40 = 388,781.37 : x
  2. Step 2: Convert to fraction form
    660,701.61/911,611.40 = 388,781.37/x
  3. Step 3: Cross multiply
    660,701.61x = 911,611.40 × 388,781.37
  4. Step 4: Simplify right side
    660,701.61x = 354,417,527,055.71
  5. Step 5: Solve for x
    x = 354,417,527,055.71/660,701.61
  6. Step 6: Final answer
    x = 536,426.01

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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.