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Finding the Fourth Proportional to 1,399,632.40, 1,931,554.14 and 787,824.64

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Solution

The fourth proportional to 1,399,632.40, 1,931,554.14 and 787,824.64 is: 1,087,232.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,399,632.40 : 1,931,554.14 = 787,824.64 : x
  2. Step 2: Convert to fraction form
    1,399,632.40/1,931,554.14 = 787,824.64/x
  3. Step 3: Cross multiply
    1,399,632.40x = 1,931,554.14 × 787,824.64
  4. Step 4: Simplify right side
    1,399,632.40x = 1,521,725,944,986.01
  5. Step 5: Solve for x
    x = 1,521,725,944,986.01/1,399,632.40
  6. Step 6: Final answer
    x = 1,087,232.58

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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.