Home / 716,789.49-989,169.64-390,103.76

Finding the Fourth Proportional to 716,789.49, 989,169.64 and 390,103.76

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Solution

The fourth proportional to 716,789.49, 989,169.64 and 390,103.76 is: 538,343.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    716,789.49 : 989,169.64 = 390,103.76 : x
  2. Step 2: Convert to fraction form
    716,789.49/989,169.64 = 390,103.76/x
  3. Step 3: Cross multiply
    716,789.49x = 989,169.64 × 390,103.76
  4. Step 4: Simplify right side
    716,789.49x = 385,878,797,339.51
  5. Step 5: Solve for x
    x = 385,878,797,339.51/716,789.49
  6. Step 6: Final answer
    x = 538,343.27

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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.