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Finding the Fourth Proportional to 712,672.83, 983,488.74 and 390,394.53

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Solution

The fourth proportional to 712,672.83, 983,488.74 and 390,394.53 is: 538,744.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    712,672.83 : 983,488.74 = 390,394.53 : x
  2. Step 2: Convert to fraction form
    712,672.83/983,488.74 = 390,394.53/x
  3. Step 3: Cross multiply
    712,672.83x = 983,488.74 × 390,394.53
  4. Step 4: Simplify right side
    712,672.83x = 383,948,624,412.59
  5. Step 5: Solve for x
    x = 383,948,624,412.59/712,672.83
  6. Step 6: Final answer
    x = 538,744.58

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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.