Home / 712,629.20-983,428.08-390,359.36

Finding the Fourth Proportional to 712,629.20, 983,428.08 and 390,359.36

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Solution

The fourth proportional to 712,629.20, 983,428.08 and 390,359.36 is: 538,695.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    712,629.20 : 983,428.08 = 390,359.36 : x
  2. Step 2: Convert to fraction form
    712,629.20/983,428.08 = 390,359.36/x
  3. Step 3: Cross multiply
    712,629.20x = 983,428.08 × 390,359.36
  4. Step 4: Simplify right side
    712,629.20x = 383,890,355,914.83
  5. Step 5: Solve for x
    x = 383,890,355,914.83/712,629.20
  6. Step 6: Final answer
    x = 538,695.80

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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.