Home / 630,895.07-870,947.36-389,310.68

Finding the Fourth Proportional to 630,895.07, 870,947.36 and 389,310.68

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Solution

The fourth proportional to 630,895.07, 870,947.36 and 389,310.68 is: 537,441.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    630,895.07 : 870,947.36 = 389,310.68 : x
  2. Step 2: Convert to fraction form
    630,895.07/870,947.36 = 389,310.68/x
  3. Step 3: Cross multiply
    630,895.07x = 870,947.36 × 389,310.68
  4. Step 4: Simplify right side
    630,895.07x = 339,069,108,965.81
  5. Step 5: Solve for x
    x = 339,069,108,965.81/630,895.07
  6. Step 6: Final answer
    x = 537,441.37

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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.