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Finding the Fourth Proportional to 712,671.84, 983,487.36 and 390,393.54

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Solution

The fourth proportional to 712,671.84, 983,487.36 and 390,393.54 is: 538,743.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    712,671.84 : 983,487.36 = 390,393.54 : x
  2. Step 2: Convert to fraction form
    712,671.84/983,487.36 = 390,393.54/x
  3. Step 3: Cross multiply
    712,671.84x = 983,487.36 × 390,393.54
  4. Step 4: Simplify right side
    712,671.84x = 383,947,112,015.65
  5. Step 5: Solve for x
    x = 383,947,112,015.65/712,671.84
  6. Step 6: Final answer
    x = 538,743.21

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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.