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Finding the Fourth Proportional to 690,142.10, 952,372.77 and 388,277.78

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Solution

The fourth proportional to 690,142.10, 952,372.77 and 388,277.78 is: 535,810.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    690,142.10 : 952,372.77 = 388,277.78 : x
  2. Step 2: Convert to fraction form
    690,142.10/952,372.77 = 388,277.78/x
  3. Step 3: Cross multiply
    690,142.10x = 952,372.77 × 388,277.78
  4. Step 4: Simplify right side
    690,142.10x = 369,785,184,868.05
  5. Step 5: Solve for x
    x = 369,785,184,868.05/690,142.10
  6. Step 6: Final answer
    x = 535,810.21

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1.5x scale

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.