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Finding the Fourth Proportional to 719,248,509.78, 992,562,911.01 and 389,223,657.78

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Solution

The fourth proportional to 719,248,509.78, 992,562,911.01 and 389,223,657.78 is: 537,128,630.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    719,248,509.78 : 992,562,911.01 = 389,223,657.78 : x
  2. Step 2: Convert to fraction form
    719,248,509.78/992,562,911.01 = 389,223,657.78/x
  3. Step 3: Cross multiply
    719,248,509.78x = 992,562,911.01 × 389,223,657.78
  4. Step 4: Simplify right side
    719,248,509.78x = 386,328,966,800,076,800
  5. Step 5: Solve for x
    x = 386,328,966,800,076,800/719,248,509.78
  6. Step 6: Final answer
    x = 537,128,630.16

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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.