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Finding the Fourth Proportional to 612,987.68, 917,710.05 and 388,601.48

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Solution

The fourth proportional to 612,987.68, 917,710.05 and 388,601.48 is: 581,779.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    612,987.68 : 917,710.05 = 388,601.48 : x
  2. Step 2: Convert to fraction form
    612,987.68/917,710.05 = 388,601.48/x
  3. Step 3: Cross multiply
    612,987.68x = 917,710.05 × 388,601.48
  4. Step 4: Simplify right side
    612,987.68x = 356,623,487,392.41
  5. Step 5: Solve for x
    x = 356,623,487,392.41/612,987.68
  6. Step 6: Final answer
    x = 581,779.21

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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.