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Finding the Fourth Proportional to 630,534.15, 869,909.74 and 485,384.32

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Solution

The fourth proportional to 630,534.15, 869,909.74 and 485,384.32 is: 669,655.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    630,534.15 : 869,909.74 = 485,384.32 : x
  2. Step 2: Convert to fraction form
    630,534.15/869,909.74 = 485,384.32/x
  3. Step 3: Cross multiply
    630,534.15x = 869,909.74 × 485,384.32
  4. Step 4: Simplify right side
    630,534.15x = 422,240,548,824.74
  5. Step 5: Solve for x
    x = 422,240,548,824.74/630,534.15
  6. Step 6: Final answer
    x = 669,655.33

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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.