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Finding the Fourth Proportional to 712,626.54, 983,425.05 and 390,342.03

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Solution

The fourth proportional to 712,626.54, 983,425.05 and 390,342.03 is: 538,672.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    712,626.54 : 983,425.05 = 390,342.03 : x
  2. Step 2: Convert to fraction form
    712,626.54/983,425.05 = 390,342.03/x
  3. Step 3: Cross multiply
    712,626.54x = 983,425.05 × 390,342.03
  4. Step 4: Simplify right side
    712,626.54x = 383,872,130,369.85
  5. Step 5: Solve for x
    x = 383,872,130,369.85/712,626.54
  6. Step 6: Final answer
    x = 538,672.23

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Double scale
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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.