Home / 716,786.36-989,165.32-390,100.64

Finding the Fourth Proportional to 716,786.36, 989,165.32 and 390,100.64

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Solution

The fourth proportional to 716,786.36, 989,165.32 and 390,100.64 is: 538,338.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    716,786.36 : 989,165.32 = 390,100.64 : x
  2. Step 2: Convert to fraction form
    716,786.36/989,165.32 = 390,100.64/x
  3. Step 3: Cross multiply
    716,786.36x = 989,165.32 × 390,100.64
  4. Step 4: Simplify right side
    716,786.36x = 385,874,026,870.72
  5. Step 5: Solve for x
    x = 385,874,026,870.72/716,786.36
  6. Step 6: Final answer
    x = 538,338.97

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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.