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Finding the Fourth Proportional to 712,703.40, 983,530.95 and 390,425.10

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Solution

The fourth proportional to 712,703.40, 983,530.95 and 390,425.10 is: 538,786.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    712,703.40 : 983,530.95 = 390,425.10 : x
  2. Step 2: Convert to fraction form
    712,703.40/983,530.95 = 390,425.10/x
  3. Step 3: Cross multiply
    712,703.40x = 983,530.95 × 390,425.10
  4. Step 4: Simplify right side
    712,703.40x = 383,995,169,506.85
  5. Step 5: Solve for x
    x = 383,995,169,506.85/712,703.40
  6. Step 6: Final answer
    x = 538,786.78

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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.