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Finding the Fourth Proportional to 644,075.91, 964,618.92 and 621,656.40

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Solution

The fourth proportional to 644,075.91, 964,618.92 and 621,656.40 is: 931,041.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,075.91 : 964,618.92 = 621,656.40 : x
  2. Step 2: Convert to fraction form
    644,075.91/964,618.92 = 621,656.40/x
  3. Step 3: Cross multiply
    644,075.91x = 964,618.92 × 621,656.40
  4. Step 4: Simplify right side
    644,075.91x = 599,661,525,179.09
  5. Step 5: Solve for x
    x = 599,661,525,179.09/644,075.91
  6. Step 6: Final answer
    x = 931,041.69

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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.