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Finding the Fourth Proportional to 630,895.70, 870,948.23 and 389,311.31

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Solution

The fourth proportional to 630,895.70, 870,948.23 and 389,311.31 is: 537,442.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    630,895.70 : 870,948.23 = 389,311.31 : x
  2. Step 2: Convert to fraction form
    630,895.70/870,948.23 = 389,311.31/x
  3. Step 3: Cross multiply
    630,895.70x = 870,948.23 × 389,311.31
  4. Step 4: Simplify right side
    630,895.70x = 339,069,990,062.18
  5. Step 5: Solve for x
    x = 339,069,990,062.18/630,895.70
  6. Step 6: Final answer
    x = 537,442.23

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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.