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Finding the Fourth Proportional to 630,897.20, 870,950.30 and 389,312.81

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Solution

The fourth proportional to 630,897.20, 870,950.30 and 389,312.81 is: 537,444.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    630,897.20 : 870,950.30 = 389,312.81 : x
  2. Step 2: Convert to fraction form
    630,897.20/870,950.30 = 389,312.81/x
  3. Step 3: Cross multiply
    630,897.20x = 870,950.30 × 389,312.81
  4. Step 4: Simplify right side
    630,897.20x = 339,072,102,362.03
  5. Step 5: Solve for x
    x = 339,072,102,362.03/630,897.20
  6. Step 6: Final answer
    x = 537,444.30

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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.