Home / 712,428.45-983,117.34-390,140.30

Finding the Fourth Proportional to 712,428.45, 983,117.34 and 390,140.30

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Solution

The fourth proportional to 712,428.45, 983,117.34 and 390,140.30 is: 538,375.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    712,428.45 : 983,117.34 = 390,140.30 : x
  2. Step 2: Convert to fraction form
    712,428.45/983,117.34 = 390,140.30/x
  3. Step 3: Cross multiply
    712,428.45x = 983,117.34 × 390,140.30
  4. Step 4: Simplify right side
    712,428.45x = 383,553,689,047.22
  5. Step 5: Solve for x
    x = 383,553,689,047.22/712,428.45
  6. Step 6: Final answer
    x = 538,375.03

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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.