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Finding the Fourth Proportional to 1,223,984, 1,689,256.32 and 687,440

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Solution

The fourth proportional to 1,223,984, 1,689,256.32 and 687,440 is: 948,756.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,223,984 : 1,689,256.32 = 687,440 : x
  2. Step 2: Convert to fraction form
    1,223,984/1,689,256.32 = 687,440/x
  3. Step 3: Cross multiply
    1,223,984x = 1,689,256.32 × 687,440
  4. Step 4: Simplify right side
    1,223,984x = 1,161,262,364,620.80
  5. Step 5: Solve for x
    x = 1,161,262,364,620.80/1,223,984
  6. Step 6: Final answer
    x = 948,756.16

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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.