Home / 1,187,056.16-1,638,138.96-643,191.78

Finding the Fourth Proportional to 1,187,056.16, 1,638,138.96 and 643,191.78

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Solution

The fourth proportional to 1,187,056.16, 1,638,138.96 and 643,191.78 is: 887,605.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,187,056.16 : 1,638,138.96 = 643,191.78 : x
  2. Step 2: Convert to fraction form
    1,187,056.16/1,638,138.96 = 643,191.78/x
  3. Step 3: Cross multiply
    1,187,056.16x = 1,638,138.96 × 643,191.78
  4. Step 4: Simplify right side
    1,187,056.16x = 1,053,637,513,569.75
  5. Step 5: Solve for x
    x = 1,053,637,513,569.75/1,187,056.16
  6. Step 6: Final answer
    x = 887,605.45

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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.