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Finding the Fourth Proportional to 712,564.21, 983,338.95 and 390,294.78

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Solution

The fourth proportional to 712,564.21, 983,338.95 and 390,294.78 is: 538,606.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    712,564.21 : 983,338.95 = 390,294.78 : x
  2. Step 2: Convert to fraction form
    712,564.21/983,338.95 = 390,294.78/x
  3. Step 3: Cross multiply
    712,564.21x = 983,338.95 × 390,294.78
  4. Step 4: Simplify right side
    712,564.21x = 383,792,059,155.68
  5. Step 5: Solve for x
    x = 383,792,059,155.68/712,564.21
  6. Step 6: Final answer
    x = 538,606.98

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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.