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Finding the Fourth Proportional to 644,070.40, 964,610.66 and 621,650.90

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Solution

The fourth proportional to 644,070.40, 964,610.66 and 621,650.90 is: 931,033.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,070.40 : 964,610.66 = 621,650.90 : x
  2. Step 2: Convert to fraction form
    644,070.40/964,610.66 = 621,650.90/x
  3. Step 3: Cross multiply
    644,070.40x = 964,610.66 × 621,650.90
  4. Step 4: Simplify right side
    644,070.40x = 599,651,084,938.59
  5. Step 5: Solve for x
    x = 599,651,084,938.59/644,070.40
  6. Step 6: Final answer
    x = 931,033.45

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1.5x scale

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.