Home / 712,629.80-983,429.54-390,345.28

Finding the Fourth Proportional to 712,629.80, 983,429.54 and 390,345.28

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Solution

The fourth proportional to 712,629.80, 983,429.54 and 390,345.28 is: 538,676.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    712,629.80 : 983,429.54 = 390,345.28 : x
  2. Step 2: Convert to fraction form
    712,629.80/983,429.54 = 390,345.28/x
  3. Step 3: Cross multiply
    712,629.80x = 983,429.54 × 390,345.28
  4. Step 4: Simplify right side
    712,629.80x = 383,877,079,151.57
  5. Step 5: Solve for x
    x = 383,877,079,151.57/712,629.80
  6. Step 6: Final answer
    x = 538,676.71

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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.