Home / 621,065.40-856,821.42-391,547.16

Finding the Fourth Proportional to 621,065.40, 856,821.42 and 391,547.16

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Solution

The fourth proportional to 621,065.40, 856,821.42 and 391,547.16 is: 540,178.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    621,065.40 : 856,821.42 = 391,547.16 : x
  2. Step 2: Convert to fraction form
    621,065.40/856,821.42 = 391,547.16/x
  3. Step 3: Cross multiply
    621,065.40x = 856,821.42 × 391,547.16
  4. Step 4: Simplify right side
    621,065.40x = 335,485,993,628.17
  5. Step 5: Solve for x
    x = 335,485,993,628.17/621,065.40
  6. Step 6: Final answer
    x = 540,178.21

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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.