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Finding the Fourth Proportional to 1,223,679, 1,688,421 and 740,149.56

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Solution

The fourth proportional to 1,223,679, 1,688,421 and 740,149.56 is: 1,021,251.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,223,679 : 1,688,421 = 740,149.56 : x
  2. Step 2: Convert to fraction form
    1,223,679/1,688,421 = 740,149.56/x
  3. Step 3: Cross multiply
    1,223,679x = 1,688,421 × 740,149.56
  4. Step 4: Simplify right side
    1,223,679x = 1,249,684,060,244.76
  5. Step 5: Solve for x
    x = 1,249,684,060,244.76/1,223,679
  6. Step 6: Final answer
    x = 1,021,251.54

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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.