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Finding the Fourth Proportional to 661,699.28, 913,095.24 and 389,790.80

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Solution

The fourth proportional to 661,699.28, 913,095.24 and 389,790.80 is: 537,881.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,699.28 : 913,095.24 = 389,790.80 : x
  2. Step 2: Convert to fraction form
    661,699.28/913,095.24 = 389,790.80/x
  3. Step 3: Cross multiply
    661,699.28x = 913,095.24 × 389,790.80
  4. Step 4: Simplify right side
    661,699.28x = 355,916,124,075.79
  5. Step 5: Solve for x
    x = 355,916,124,075.79/661,699.28
  6. Step 6: Final answer
    x = 537,881.99

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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.